Fix walls.
FakePlayer now make random moves.
Add additional info in exceptions.
Fix WalkMove directions.
UI::Console prints board after each move.
Fix wall collisions.
Add methods to UI::Console to handle display.

Add methods:
- init_board_repr;
- redraw_pawn;
- draw_wall;
- print_walk_move;
- print_wall_move;
Add method Wall::end_pos.
Fix wall end positions.